Electric motor



Aug. 7, 1928.

c. T. BRADSHAW ELECTRIC MOTOR Filed Dec. 17, 1924 2 Sheets-Sheet 1 INVEN TOR 1 a 8.%;mdA Lw A TTORN c. T'; BRADSHAW ELECTRIC MOTOR Filed Dec.17, 1924 2 Sheets-Sheet 2 12.11.1131 if a 6 I I L j I 6 v mu I 9 /Z I Iur-ifi'aj WM EWNNIIIININ W 6 "H' E INVENTOR ATTORN 110 member5andaweightedextenslon mem- Patented Aug. 7, 1928.

I D ATES;

CHARLES T. BRADSHAW, oft PHILADELPHIA, PENNSYLVAN A, A

CARRAINE, 01 PHILADELPHIA, "PENNSYLVANIAA a 1 ELEoTRic oron.

i I ihppl icat ion fiie i'n ce er '17, 19'24. Seria1No.756,45 1. V

i This invention "relates to electricflmotors" andjhas'for one of; 'itsprimary objects the provision of la motorot novel construction having anosc llating; power transmitting i :5 member adapted to actuate dlhyflanelectrical device under control of said member.

I aim "to provide a motor Whichis simple in construction, inexpensiveitomanufacture,

and the parts of which arearranged soasto 1Q, bereadily accessible forreplacement." A

further aim is to provide aTn iag'netically operated pendulum motor'iiiivhich the electr'omagnet may: he quickly adjustecl to give speedchanges and'to set thedevice 'nrposi 1g tion for usewitheither AXC. orur rent.

still further aim is "thejprovision of motor of the foregoing. characterin whlch ing the invention. V o l I Figuredlishflface view of myimproved mo'tor shown applied to the rearstructure 30 of an'advertisingdisplay service. 1 F igure 21is an enlarged'ia'ce view ofthe motor. Figure 3is a section taken; on the line 3 3 r p c Figure 4;is a section ta'lten ontheline of if f "Referring nowmorepa-rticularlyto Figs 2;"3 and 4, it ,Will .b'eV-seen'that in this instance ,the motorin general is composedi of a "frame o'r support A of any. suitable sizeand shape electromagnet C and a control mechanism D. f The pendulum Bismountedon-the support Aat 45in any convenientmamienand at this instanceconsists ofa. resilient metalher 6." The metallic member 56f the penduvlam-serves as the armature for-"the. electromagnet, it being disposedin proper relation to the electro-magnet so that when the magnet is,energized it] will attract the armature portion of theg-pendulumf p I fTheelectr o-magnet .is ofi sual constructioii itscOrQ TQhQWVever,extending a suiti- In the accompanying drawings for, the purposeintended,apen'dulum B, an v ssiGNoIt EOLEUGENE" a convenient means formounting the net on afmovable support Qino to be de-' scribed; 1 I

The; able support: 9 is'in the' 'l'or m bracket 10 and ispivotallymounted on the} onvvhich the bracket 10 pivots and a screw. threadedportion 13 forreceiving thehut 14, by means ofjtvhic'h'the'pivotpin fl ssecured tothe support Ag i 1 main support by means of the pivotj pin a11, saicl pin having a shouldered porti0nf12 As thus far described itwiirtisehth itj i when the 'electro-magnet 'C is energized; thependulum'B Will be attracted bylvirtue'ofits armature portion and Whentie-energized "the pendulum will swing in the opposite direc tion; Thus,by supplying" and cuttingofi .v

the ctirrent in alternatesucces'sion, a con tinued swingingmovementflisfimparted An. importantffeature of'this invention resides inthe mannerin ivhich' I automati cally controlthe currentto bringaboutthe aboveresults, through the'medium"ofthe' control device D..Thisdgvic ishereishotvn as c omposed of. an arm "15 pivotallymounte don'the'" support A at 16; having a pair of I adjustable abutment's 17and "18' between WhlCll the pendulum B passes. Z The free end of the arm15'carries a cont'act; in this infstance shown as agrolle'r contact 19,it-,b'eing understood; however, that any other suitable form "of contactmight be usedif' Them'ov-j able rollerzcontact I9 'co-operates'fvvi'thfa fixed comm zo 'cmia by the-{insulating member which, {in turn, issecured to the supportAi {It is herepoihted out that pivoted arm '15,the fixedcontact 2O andthe pendulum are alimcnmedin such relatiofito flanothers'o that as the pendulum assumes its nornial orfrest positionthe' contacts'ar e' in position to open the circuit to beherein} afterdescribed." 2

,Referring now more especially" to 2 it vvill' be seen that' aftvire221mm the source ofielect-ric currentisconnected to one enld of {he an,Of the electroariagnefl mai man" th i tll n f h o l is c n i jfthe Wire23 tojthefpivot 16'of thefcontr ol} ling device arm", pi-n16 insulatedfrom the support A. QA Wire 24 is' conjnecjte d source lof electric Icurrentf Thus it en whenthe q a tsi re in cl dap l l that the currentpasses through the wire 22,

, the coil of the electro-magnet G, wire 23,

arm 15, roller contact 19, fixed contact I and wire 24 completing thecircuit. In or-,

der to minimize the spark caused by the making and breaking of thecontacts I have connected a shunt of any suitable type across thecontacts.

Assuming the pendulum to be at its rest 7 position and that itis desiredto start the device {in operation, is only necessary to rock thependulum slightly. This rocks the pivoted arm .15. by strikingfirst oneof its abutments 17 and 18 and then the. other, f thereby causing themovable contact 19 to abutment 18 and breaksv the circuit. The

time at which the contacts make and break can be altered by adjustingthe abutments 17 and 18. The pendulum upon striking the core of thearmature is given a sharp re bound, by virtue 'of the resiliency" of itsmember '5 again closing .the circuit and so on, until either the currentiscut off or the pendulum forcibly stopped. In other words,

the pendulum is yieldingly arrested in its movement which avoids unduestrains on the mechanism and, at the same time serves to givemomentumthereto for its return movement. A similar rebound is effected as thependulum swings to the left by its engagement with the abutment 17 ofthe arm. which is limited in movement by its engagement with theshoulder 26 of the member21.

If desired, the/speed of the motor can be altered by adjusting theelectro-magnet by meansof the piyoted bracket liereinbeforedescribedtoward or. from the, armature portion 5 of, the pendulum. Whenadjustment is made forslow speed the gap. between the electrosmagnet andpendulum .is increased and the' abutments' 17 and'lS then serve toarrest the movement of the pendulum. By thus altering-theoperativerelation of the pendulum andthe electro-m-agnet I am eniabled tooperatemy device either with alters nating or direct current, settingthemagnet in close relation to the pendulum for alternating current andincreasing the gap for direct current.

Referringnow to Figs. .2 and 3, it will be seenthat tension is appliedto the contact i roller 19 and to the arm 15 by means of the tensionspring 27. This makes for efiective contact between. the roller andfixed contact and also serves to frictionally hold the arm in its normalposition which it'assumes when thependulum comes to rest. If desired,the arm 15 may be made of any suitable spring materialto accomplish theaforesaid result.

While I have described my motor as havenergized pendulum C swings to theright and pendulum E swings to the left.

Reverting now to Fig. 1, I have shown therein anadvcrtising displaydevice in rear View with my improved motor applied thereto. The displayrepresents a maid 28 churning butter in a cocoanut shell 29 whichissecu-red to any suitable form of framework 30 for holding itin anupright position. The member representing the maid is pivoted at 31 tothe framework 30, said pivot having an extending arm 32 connected to'thependulum B by means of a link 33. By so connecting the motor to thedisplay device it will beseen that the effect of a maid churning butteris produced' If desired, similar connections may be made to thepen dulumE for operating other conveniently located members. It is to be notedthat the extension member 6 of the pendulum. is pivotally connected, at34, to the armature portion 5 of the pendulum to avoid binding of thependulum.

WVhile I have described the motor as operating a display device, it isto be understood that I do not limit the use of my invention to such,it'beingc'lear that it may be advantageously used for many otherpurposes. I v

' I claim a 1. In an electric motor, the combination of a support, anelectro-magnet carried thereby, a pendulum mounted on the support andhaving anarmatureadjacent to-said electromagnet, a member pivoted on thesupport and provided with an electrical contactv part and two spacedabutments between which the pendulum extends, 'a fixed contact part,

and means to include the electro-magnet and said contact parts in anelectric circuit which may be openedand closed by said contact parts,the pendulum and the abutments being constructed to move the contactpart carried by the member into engagement with the fixed contact partwhen the pendulum swings from the electro-magnet-and out' of engagementwith the fixed contact part when the pendulum swings toward theelectro-magnet and said pendulum being movable wholly by gravity when itswings from the electro-magnet. i

2. In an electric motor, the combination of a support, an electre-magnetcarried'thereby, a pendulum.mounted on the support and having anarmature adjacent to said' electro magnet, a'member movable on thesupport andprovided with an electrical contact part and two spacedabutments I between which the pendulum extends, a fixed contact part,means to include the electro-Inagnet and said Contact parts in anelectric circuit which may be opened and closed by sald contact parts,the pendulum and the abutments being constructed to move the contactpart carried by the member into engagement with the fixed contact partwhen the pendulum swings from the electro-Inagnet and out of engagementwith the fixed contact part when the pendulum swings toward theelectro-Inagnet, and means operable to vary the distance between theelectro-magnet and the armature of the pendulum.

3. In an electric motor, the combination of a support, a pair of movablepower transmittin g members mounted on the support each havlng anarmature portion, an electric circuit including an electro-magnetmounted 7 of a support, a pair of pendulums mounted on the support andeach having anarmature portion, an electric circuit ncluding anelectro-magnet mounted on the support between, said pendulums and adacent to the arma ture portions thereof for actuating them, said circuitincluding means operated vby "one of the pendulums for automaticallyopening and closing the same. 7

5. In an electric motor, the combination of a support, an electro-magnetcarried thereby, a pendulum mounted on the'support and having anarmature adjacent to said :electro-magnet, a spring pressed ,memberpivoted on the support and provided with an electrical contact rollerpressed toward said contact part and two spaced abutments between whichthe pendulum extends, and

means to include the electro-magnet and said contact part and. saidroller in an'electric circuit which may be opened and closed by saidpart and said roller, the pendulum and the abutments being constructedto move the contact roller into engagement with the fixed contact partwhen the pendulum swings from the electro-magnet and out of engagementwith the fixed contact partWheIl the pendulum swings toward theelectro-magnet, and said roller being pressed by saidmember against saidpart.

6. In an electric motor, the combination of a support, an electriccircuit includingan electro-magnet ,mounted on the support, a pendulumon the support and constructed to swing from side to side of a normalhanging position and havingan armature adja-.

cent to the electro-magnet, said circuit ineluding a contact part fixedon the support,

a member movable on the support and having a contact part and meansadapted to be engaged by the pendulum at each side of its normalposition to move the contact part of the movable member into and fromcontact" with the fixed contact part, said means vbeing so disposed withrelation to the pendulum that as the pendulum approaches and assumessaid normal position the circuit will be thereby opened.

In testimony whereof I affix my signature hereto.

' CHARLES T. Bnansrniw.

